1.配列を結合する同時に同じ要素を削除する.配列の一部の要素を削除

/**
 *              （      ,  ）
 *
 * @param aStr
 * @param bStr
 * @return
 */
private String mergeString(String aStr, String bStr) {
    if (aStr == null || bStr == null) {
        return null;
    }
    String[] aArr = aStr.split(",");
    String[] bArr = bStr.split(",");
    Set set = Sets.newHashSet();
    set.addAll(Arrays.asList(aArr));
    set.addAll(Arrays.asList(bArr));
    return Arrays.toString(set.toArray());
}

/**
 *  targetStr   cutStr   （      ,  ）
 *
 * @param targetStr
 * @param cutStr
 * @return
 */
private String cutString(String targetStr, String cutStr) {
    if (targetStr == null || cutStr == null) {
        return null;
    }
    String[] tarArr = targetStr.split(",");
    String[] cutArr = cutStr.split(",");
    Set set = Sets.newHashSet();
    set.addAll(Arrays.asList(tarArr));
    set.removeAll(Arrays.asList(cutArr));
    return Arrays.toString(set.toArray());
}